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integrity/ima: switch to using __kernel_read 

__kernel_read has a bunch of additional sanity checks, and this moves
the set_fs out of non-core code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Christoph Hellwig 2020-05-08 08:54:27 +02:00
parent 61a707c543
commit a1f9b1c043
1 changed files with 1 additions and 13 deletions
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14
security/integrity/iint.c
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@ -188,19 +188,7 @@ DEFINE_LSM(integrity) = {
int integrity_kernel_read(struct file *file, loff_t offset, int integrity_kernel_read(struct file *file, loff_t offset,
void *addr, unsigned long count) void *addr, unsigned long count)
{ {
mm_segment_t old_fs; return __kernel_read(file, addr, count, &offset);
char __user *buf = (char __user *)addr;
ssize_t ret;
if (!(file->f_mode & FMODE_READ))
return -EBADF;
old_fs = get_fs();
set_fs(KERNEL_DS);
ret = __vfs_read(file, buf, count, &offset);
set_fs(old_fs);
return ret;
} }
/* /*